Photoionization of the H2+ ion by ultrashort elliptically polarized laser pulses
Abstract
We report calculations for the single- and multiphoton ionization of the H2+ molecular ion irradiated by ultrashort elliptically polarized laser pulses for central photon energies ranging from close to the ionization threshold up to 300 eV. Using the fixed-nuclei approximation, the electronic response of the system is obtained through an ab initio time-dependent grid-based approach implemented in two-center prolate spheroidal coordinates. The predicted cross sections for single-photon absorption are analyzed in a time-independent framework. A concise decomposition of the cross-section patterns exists in terms of the degrees of linear and circular portions of the elliptically polarized radiation. An asymmetric rotational effect in the photoelectron angular distribution is predicted and discussed according to the above decomposition. The confinement effect, previously seen in angle-resolved cross sections for linearly polarized light, persists for circularly polarized radiation. The dependence of the calculated angular distributions on the pulse length in intense laser fields is also analyzed.
- Publication:
-
Physical Review A
- Pub Date:
- May 2013
- DOI:
- 10.1103/PhysRevA.87.053410
- Bibcode:
- 2013PhRvA..87e3410G
- Keywords:
-
- 33.80.Rv;
- 33.80.Wz;
- 32.80.Fb;
- 31.15.A-;
- Multiphoton ionization and excitation to highly excited states;
- Other multiphoton processes;
- Photoionization of atoms and ions;
- Ab initio calculations